<template>
  <!-- 拼团商品规格弹窗 -->
  <su-popup :show="show" round="10" @close="emits('close')">
    <!-- SKU 信息 -->
    <view class="ss-modal-box bg-white ss-flex-col">
      <view class="modal-header ss-flex ss-col-center">
        <view class="header-left ss-m-r-30">
          <image
            class="sku-image"
            :src="sheep.$url.cdn(state.selectedSku.picUrl || goodsInfo.picUrl)"
            mode="aspectFill"
          />
        </view>
        <view class="header-right ss-flex-col ss-row-between ss-flex-1">
          <view class="goods-title ss-line-2">
            <view class="tig ss-flex ss-col-center">
              <view class="tig-icon ss-flex ss-col-center ss-row-center">
                <view class="groupon-tag">
                  <image :src="sheep.$url.static('/static/img/shop/goods/groupon-tag-white.png')" />
                </view>
              </view>
              <view class="tig-title">拼团价</view>
            </view>
            <view class="info-title">
              {{ goodsInfo.name }}
            </view>
          </view>
          <view class="header-right-bottom ss-flex ss-col-center ss-row-between">
            <view class="price-text"> {{ fen2yuan(goodsInfo.price) }}</view>

            <view class="stock-text ss-m-l-20"> 库存{{ state.selectedSku.stock || goodsInfo.stock }}件 </view>
          </view>
        </view>
      </view>
      <view class="modal-content ss-flex-1">
        <scroll-view scroll-y="true" class="modal-content-scroll">
          <view v-for="property in propertyList" :key="property.id" class="sku-item ss-m-b-20">
            <view class="label-text ss-m-b-20">{{ property.name }}</view>
            <view class="ss-flex ss-col-center ss-flex-wrap">
              <button
                v-for="value in property.values"
                :key="value.id"
                class="ss-reset-button spec-btn"
                :class="[
                  {
                    'checked-btn': state.currentPropertyArray[property.id] === value.id,
                  },
                  {
                    'disabled-btn': value.disabled === true,
                  },
                ]"
                :disabled="value.disabled === true"
                @tap="onSelectSku(property.id, value.id)"
              >
                {{ value.name }}
              </button>
            </view>
          </view>
          <view class="buy-num-box ss-flex ss-col-center ss-row-between">
            <view class="label-text">购买数量</view>
            <su-number-box
              v-model="state.selectedSku.count"
              :min="1"
              :max="state.selectedSku.stock"
              :step="1"
              activity="groupon"
              @change="onNumberChange($event)"
            />
          </view>
        </scroll-view>
      </view>

      <!-- 操作区 -->
      <view class="modal-footer ss-p-y-20">
        <view class="buy-box ss-flex ss-col-center ss-flex ss-col-center ss-row-center">
          <view class="ss-flex">
            <button class="ss-reset-button origin-price-btn ss-flex-col">
              <view class="btn-title">{{ grouponNum + '人团' }}</view>
            </button>
            <button class="ss-reset-button btn-tox ss-flex-col" @tap="onBuy">
              <view class="btn-price">{{ fen2yuan(goodsInfo.price) }}</view>
              <view v-if="grouponAction === 'create'">立即开团</view>
              <view v-else-if="grouponAction === 'join'">参与拼团</view>
            </button>
          </view>
        </view>
      </view>
    </view>
  </su-popup>
</template>

<script setup>
import { computed, reactive, watch } from 'vue'
import sheep from '@/sheep'
import { convertProductPropertyList, fen2yuan } from '@/hooks/useGoods'

const headerBg = sheep.$url.css('/static/img/shop/goods/groupon-btn-long.png')
const emits = defineEmits(['change', 'addCart', 'buy', 'close', 'ladder'])
const props = defineProps({
  show: {
    type: Boolean,
    default: false,
  },
  goodsInfo: {
    type: Object,
    default() {},
  },
  grouponAction: {
    type: String,
    default: 'create',
  },
  grouponNum: {
    type: [Number, String],
    default: 0,
  },
})
const state = reactive({
  selectedSku: {}, // 选中的 SKU
  currentPropertyArray: [], // 当前选中的属性，实际是个 Map。key 是 property 编号，value 是 value 编号
  grouponNum: props.grouponNum,
})

const propertyList = convertProductPropertyList(props.goodsInfo.skus)

// SKU 列表
const skuList = computed(() => {
  let skuPrices = props.goodsInfo.skus
  for (let price of skuPrices) {
    price.value_id_array = price.properties.map((item) => item.valueId)
  }
  return skuPrices
})

watch(
  () => state.selectedSku,
  (newVal) => {
    emits('change', newVal)
  },
  {
    immediate: true, // 立即执行
    deep: true, // 深度监听
  }
)

// 输入框改变数量
function onNumberChange(e) {
  if (e === 0) return
  if (state.selectedSku.count === e) return
  state.selectedSku.count = e
}

// 点击购买
function onBuy() {
  if (!state.selectedSku.id || state.selectedSku.id <= 0) {
    sheep.$helper.toast('请选择规格')
    return
  }
  if (state.selectedSku.stock <= 0) {
    sheep.$helper.toast('库存不足')
    return
  }
  emits('buy', state.selectedSku)
}

// 改变禁用状态：计算每个 property 属性值的按钮，是否禁用
function changeDisabled(isChecked = false, propertyId = 0, valueId = 0) {
  let newSkus = [] // 所有可以选择的 sku 数组
  if (isChecked) {
    // 情况一：选中 property
    // 获得当前点击选中 property 的、所有可用 SKU
    for (let price of skuList.value) {
      if (price.stock <= 0) {
        continue
      }
      if (price.value_id_array.indexOf(valueId) >= 0) {
        newSkus.push(price)
      }
    }
  } else {
    // 情况二：取消选中 property
    // 当前所选 property 下，所有可以选择的 SKU
    newSkus = getCanUseSkuList()
  }

  // 所有存在并且有库存未选择的 SKU 的 value 属性值 id
  let noChooseValueIds = []
  for (let price of newSkus) {
    noChooseValueIds = noChooseValueIds.concat(price.value_id_array)
  }
  noChooseValueIds = Array.from(new Set(noChooseValueIds)) // 去重

  if (isChecked) {
    // 去除当前选中的 value 属性值 id
    let index = noChooseValueIds.indexOf(valueId)
    noChooseValueIds.splice(index, 1)
  } else {
    // 循环去除当前已选择的 value 属性值 id
    state.currentPropertyArray.forEach((currentPropertyId) => {
      if (currentPropertyId.toString() !== '') {
        return
      }
      // currentPropertyId 为空是反选 填充的
      let index = noChooseValueIds.indexOf(currentPropertyId)
      if (index >= 0) {
        // currentPropertyId 存在于 noChooseValueIds
        noChooseValueIds.splice(index, 1)
      }
    })
  }

  // 当前已选择的 property 数组
  let choosePropertyIds = []
  if (!isChecked) {
    // 当前已选择的 property
    state.currentPropertyArray.forEach((currentPropertyId, currentValueId) => {
      if (currentPropertyId !== '') {
        // currentPropertyId 为空是反选 填充的
        choosePropertyIds.push(currentValueId)
      }
    })
  } else {
    // 当前点击选择的 property
    choosePropertyIds = [propertyId]
  }

  for (let propertyIndex in propertyList) {
    // 当前点击的 property、或者取消选择时候，已选中的 property 不进行处理
    if (choosePropertyIds.indexOf(propertyList[propertyIndex]['id']) >= 0) {
      continue
    }
    // 如果当前 property id 不存在于有库存的 SKU 中，则禁用
    for (let valueIndex in propertyList[propertyIndex]['values']) {
      propertyList[propertyIndex]['values'][valueIndex]['disabled'] =
        noChooseValueIds.indexOf(propertyList[propertyIndex]['values'][valueIndex]['id']) < 0 // true 禁用 or false 不禁用
    }
  }
}

// 当前所选属性下，获取所有有库存的 SKU 们
function getCanUseSkuList() {
  let newSkus = []
  for (let sku of skuList.value) {
    if (sku.stock <= 0) {
      continue
    }
    let isOk = true
    state.currentPropertyArray.forEach((propertyId) => {
      // propertyId 不为空，并且，这个 条 sku 没有被选中，则排除
      if (propertyId.toString() !== '' && sku.value_id_array.indexOf(propertyId) < 0) {
        isOk = false
      }
    })
    if (isOk) {
      newSkus.push(sku)
    }
  }
  return newSkus
}

// 选择规格
function onSelectSku(propertyId, valueId) {
  // 清空已选择
  let isChecked = true // 选中 or 取消选中
  if (state.currentPropertyArray[propertyId] !== undefined && state.currentPropertyArray[propertyId] === valueId) {
    // 点击已被选中的，删除并填充 ''
    isChecked = false
    state.currentPropertyArray.splice(propertyId, 1, '')
  } else {
    // 选中
    state.currentPropertyArray[propertyId] = valueId
  }

  // 选中的 property 大类
  let choosePropertyId = []
  state.currentPropertyArray.forEach((currentPropertyId) => {
    if (currentPropertyId !== '') {
      // currentPropertyId 为空是反选 填充的
      choosePropertyId.push(currentPropertyId)
    }
  })

  // 当前所选 property 下，所有可以选择的 SKU 们
  let newSkuList = getCanUseSkuList()

  // 判断所有 property 大类是否选择完成
  if (choosePropertyId.length === propertyList.length && newSkuList.length) {
    newSkuList[0].count = state.selectedSku.count || 1
    state.selectedSku = newSkuList[0]
  } else {
    state.selectedSku = {}
  }

  // 改变 property 禁用状态
  changeDisabled(isChecked, propertyId, valueId)
}

changeDisabled(false)
// TODO 芋艿：待讨论的优化点：1）单规格，要不要默认选中；2）默认要不要选中第一个规格
</script>

<style lang="scss" scoped>
// 购买
.buy-btn {
  margin: 0 20rpx;
  width: 100%;
  height: 80rpx;
  border-radius: 40rpx;
  background: linear-gradient(90deg, #ff6000, #fe832a);
  color: #fff;
}
.btn-tox {
  width: 382rpx;
  height: 80rpx;
  font-size: 24rpx;
  font-weight: 600;
  margin-left: -50rpx;
  background-image: v-bind(headerBg);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  color: #ffffff;
  line-height: normal;
  border-radius: 0px 40rpx 40rpx 0px;

  .btn-price {
    font-family: OPPOSANS;

    &::before {
      content: '￥';
    }
  }
}
.origin-price-btn {
  width: 370rpx;
  height: 80rpx;
  background: rgba(#ff5651, 0.1);
  color: #ff6000;
  border-radius: 40rpx 0px 0px 40rpx;
  line-height: normal;
  font-size: 24rpx;
  font-weight: 500;

  .btn-price {
    font-family: OPPOSANS;

    &::before {
      content: '￥';
    }
  }

  .btn-title {
    font-size: 28rpx;
  }
}

.ss-modal-box {
  border-radius: 30rpx 30rpx 0 0;
  max-height: 1000rpx;

  .modal-header {
    position: relative;
    padding: 80rpx 20rpx 40rpx;

    .sku-image {
      width: 160rpx;
      height: 160rpx;
      border-radius: 10rpx;
    }

    .header-right {
      height: 160rpx;
    }

    .close-icon {
      position: absolute;
      top: 10rpx;
      right: 20rpx;
      font-size: 46rpx;
      opacity: 0.2;
    }

    .goods-title {
      font-size: 28rpx;
      font-weight: 500;
      line-height: 42rpx;
      position: relative;
      .tig {
        border: 2rpx solid #ff6000;
        border-radius: 4rpx;
        width: 126rpx;
        height: 38rpx;
        position: absolute;
        left: 0;
        top: 0;

        .tig-icon {
          width: 40rpx;
          height: 40rpx;
          background: #ff6000;
          margin-left: -2rpx;
          border-radius: 4rpx 0 0 4rpx;

          .groupon-tag {
            width: 32rpx;
            height: 32rpx;
          }
        }

        .tig-title {
          font-size: 24rpx;
          font-weight: 500;
          line-height: normal;
          color: #ff6000;
          width: 86rpx;
          display: flex;
          justify-content: center;
          align-items: center;
        }
      }
      .info-title {
        text-indent: 132rpx;
      }
    }

    .price-text {
      font-size: 30rpx;
      font-weight: 500;
      color: $red;
      font-family: OPPOSANS;

      &::before {
        content: '￥';
        font-size: 24rpx;
      }
    }

    .stock-text {
      font-size: 26rpx;
      color: #999999;
    }
  }

  .modal-content {
    padding: 0 20rpx;

    .modal-content-scroll {
      max-height: 600rpx;

      .label-text {
        font-size: 26rpx;
        font-weight: 500;
      }

      .buy-num-box {
        height: 100rpx;
      }

      .spec-btn {
        height: 60rpx;
        min-width: 100rpx;
        padding: 0 30rpx;
        background: #f4f4f4;
        border-radius: 30rpx;
        color: #434343;
        font-size: 26rpx;
        margin-right: 10rpx;
        margin-bottom: 10rpx;
      }

      .checked-btn {
        background: linear-gradient(90deg, #ff6000, #fe832a);
        font-weight: 500;
        color: #ffffff;
      }

      .disabled-btn {
        font-weight: 400;
        color: #c6c6c6;
        background: #f8f8f8;
      }
    }
  }
}

image {
  width: 100%;
  height: 100%;
}
</style>
